Total Bridges
20,753
Public highway bridges in Iowa
State profile · Above national median SD
Iowa bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Iowa — drawn straight from the FHWA National Bridge Inventory.
- 20,753
- Public bridges
- 36.5%
- Good condition
- 20.0%
- Poor condition
- 20.0%
- Structurally deficient
Good Condition
36.5%
7,582 bridges rated 7-9
-13.5pp vs 50% benchmark
Poor Condition
20.0%
4,153 bridges rated 0-4
Structurally Deficient
20.0%
4,153 bridges flagged for repair priority
13.0pp vs national avg 7.0%
Iowa vs national bridge condition
Iowa — Good condition share 36.5%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
Iowa — Structurally deficient share 66.7%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — Iowa (FHWA NBI)
Counties (99)
Adair 208 Adams 147 Allamakee 170 Appanoose 159 Audubon 161 Benton 327 Black Hawk 411 Boone 119 Bremer 220 Buchanan 281 Buena Vista 140 Butler 261 Calhoun 171 Carroll 223 Cass 237 Cedar 265 Cerro Gordo 210 Cherokee 223 Chickasaw 268 Clarke 150 Clay 138 Clayton 214 Clinton 325 Crawford 242 Dallas 154 Davis 156 Decatur 178 Delaware 254 Des Moines 156 Dickinson 73 Dubuque 304 Emmet 70 Fayette 288 Floyd 195 Franklin 214 Fremont 133 Greene 150 Grundy 270 Guthrie 236 Hamilton 134 Hancock 128 Hardin 211 Harrison 162 Henry 144 Howard 193 Humboldt 70 Ida 164 Iowa 189 Jackson 209 Jasper 321 Jefferson 142 Johnson 317 Jones 215 Keokuk 152 Kossuth 256 Lee 185 Linn 428 Louisa 134 Lucas 186 Lyon 241 Madison 221 Mahaska 219 Marion 204 Marshall 283 Mills 170 Mitchell 160 Monona 125 Monroe 126 Montgomery 184 Muscatine 127 O'Brien 229 Osceola 176 Page 185 Palo Alto 114 Plymouth 407 Pocahontas 186 Polk 415 Pottawattamie 469 Poweshiek 221 Ringgold 206 Sac 188 Scott 212 Shelby 194 Sioux 429 Story 262 Tama 307 Taylor 220 Union 153 Van Buren 142 Wapello 160 Warren 231 Washington 203 Wayne 163 Webster 179 Winnebago 48 Winneshiek 317 Woodbury 379 Worth 89 Wright 168
Iowa vs nearby ranks
Adjacent states on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Iowa on the same metric.
54
West Virginia
16.02% top marginal rate
46
South Dakota
16.24% top marginal rate
19
Iowa
20.01% top marginal rate
78
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in Iowa
Six lowest-condition bridges in Iowa, ranked by composite NBI rating. Each is inspected at least every 24 months.
270TH STREET
Structurally DeficientOver: ROSE BRANCH
071343401, Adams, IA
Built 1976 Load: 2.7 t ADT: 79
LOCAL
PoorOver: CREEK
078342601, Audubon, IA
Built 1935 Load: 2.7 t ADT: 21
KLINE RD
Structurally DeficientOver: MUD CREEK
87-12-15-02-10, Black Hawk, IA
Built 1948 Load: 2.7 t ADT: 11
LOCAL - 700TH
Structurally DeficientOver: TRIB TROUBLESOME CREEK
077351402, Cass, IA
Built 1983 Load: 2.7 t ADT: 11
LOCAL - DAYTONA
Structurally DeficientOver: BUCK CREEK
077361903, Cass, IA
Built 1980 Load: 2.7 t ADT: 35
100TH ST.
Structurally DeficientOver: UNION CREEK
083E20101, Clinton, IA
Built 1900 Load: 2.7 t ADT: 78
All Bridges in Iowa
FM
FairOver: DD JT 22
094342001, Palo Alto, IA
Built 1975 Load: 33.0 t ADT: 350
LOCAL
FairOver: DRAINAGE DDJT22
094342004, Palo Alto, IA
Built 1975 Load: 33.0 t ADT: 30
FM
FairOver: DD 80
095310601, Palo Alto, IA
Built 1975 Load: 33.0 t ADT: 133
FM
FairOver: CYLINDER CREEK
095320103, Palo Alto, IA
Built 1975 Load: 33.0 t ADT: 131
LOCAL RD
FairOver: SMALL
095322302, Palo Alto, IA
Built 1979 Load: 33.0 t ADT: 21
LOCAL
FairOver: SILVER CREEK
095342308, Palo Alto, IA
Built 1978 Load: 33.0 t ADT: 50
FM
FairOver: DD
096321502, Palo Alto, IA
Built 1973 Load: 33.0 t ADT: 40
FM
FairOver: DD
096322202, Palo Alto, IA
Built 1977 Load: 33.0 t ADT: 45
FM K-49
FairOver: MUDDY CREEK
090451502, Plymouth, IA
Built 1974 Load: 33.0 t ADT: 509
FM
FairOver: SMALL
093472302, Plymouth, IA
Built 1978 Load: 33.0 t ADT: 688
LOCAL RD
FairOver: DD #29
090343502, Pocahontas, IA
Built 1979 Load: 33.0 t ADT: 26
LOCAL
FairOver: N LIZARD CREEK DD#77
091311601, Pocahontas, IA
Built 1982 Load: 33.0 t ADT: 11
LOCAL
FairOver: DD #53 LIZARD CK
091320902, Pocahontas, IA
Built 1977 Load: 33.0 t ADT: 50
LOCAL
FairOver: N LIZARD CREEK
093330402, Pocahontas, IA
Built 1977 Load: 33.0 t ADT: 5
LOCAL
FairOver: N LIZARD CREEK
093330602, Pocahontas, IA
Built 1977 Load: 33.0 t ADT: 50
LOCAL
FairOver: N LIZARD CREEK
093330802, Pocahontas, IA
Built 1977 Load: 33.0 t ADT: 11
LOCAL
FairOver: PILOT CREEK
093331201, Pocahontas, IA
Built 1976 Load: 33.0 t ADT: 40
INDUSTRAIL CIR
FairOver: CREEK
000000000, Polk, IA
Built 1998 Load: 33.0 t ADT: 1,138
LOCAL
FairOver: SMALL STREAM
086372501, Sac, IA
Built 1971 Load: 33.0 t ADT: 20
FM
FairOver: SMALL
087353301, Sac, IA
Built 1979 Load: 33.0 t ADT: 71
FM
FairOver: SMALL
088370504, Sac, IA
Built 1978 Load: 33.0 t ADT: 30
FM
FairOver: SMALL STREAM
078370305, Shelby, IA
Built 1957 Load: 33.0 t ADT: 240
LOCAL ROAD
FairOver: SOUTH FORK LONG CREEK
075070901, Washington, IA
Built 1965 Load: 33.0 t ADT: 131
LOCAL ROAD
FairOver: CLEMONS CREEK
075080902, Washington, IA
Built 1969 Load: 33.0 t ADT: 26
FM
FairOver: DD NO 5
087302301, Webster, IA
Built 1974 Load: 33.0 t ADT: 230
FM
FairOver: DRAINAGE DITCH NO 96
088292702, Webster, IA
Built 1976 Load: 33.0 t ADT: 429
FM
FairOver: DD NO 69
088301101, Webster, IA
Built 1974 Load: 33.0 t ADT: 339
FM
FairOver: DRAINAGE
089271802, Webster, IA
Built 1977 Load: 33.0 t ADT: 359
FM
FairOver: DRAINAGE DITCH NO 4
089272301, Webster, IA
Built 1975 Load: 33.0 t ADT: 878
FM
FairOver: DRAINAGE DITCH NO 4
089272301, Webster, IA
Built 1975 Load: 33.0 t ADT: 878
FM
FairOver: DD NO 57
089281201, Webster, IA
Built 1974 Load: 33.0 t ADT: 828
FM
FairOver: DRAINAGE DITCH NO.4
090272903, Webster, IA
Built 1987 Load: 33.0 t ADT: 26
FM
FairOver: BADGER CREEK
090280904, Webster, IA
Built 1977 Load: 33.0 t ADT: 1,257
FM
FairOver: DRAINAGE DITCH NO 3
090302801, Webster, IA
Built 1976 Load: 33.0 t ADT: 489
CORP.LINE RD
FairOver: WEST NISHNABOTNA RIVER
082361701, Carroll, IA
Built 1980 Load: 33.1 t ADT: 289
FM
FairOver: BRANCH TURKEY RIVER
097112101, Chickasaw, IA
Built 1992 Load: 33.1 t ADT: 216
FM
FairOver: WEST CREEK
073262506, Clarke, IA
Built 1971 Load: 33.1 t ADT: 428
280TH AVE
FairOver: DEEP CREEK
083E43004, Clinton, IA
Built 1975 Load: 33.1 t ADT: 51
EB US 30
FairOver: SILVER CK & UP RR
0.7 MI. E OF W JCT US 61, Clinton, IA
Built 1970 Load: 33.1 t ADT: 8,550
FM
FairOver: GRAND RIVER
070272702, Decatur, IA
Built 1959 Load: 33.1 t ADT: 89
LOCAL
FairOver: STREAM
081330702, Guthrie, IA
Built 1995 Load: 33.1 t ADT: 29
FM
FairOver: COPPER CREEK
084E52802, Jackson, IA
Built 1974 Load: 33.1 t ADT: 1,070
SW 470TH ST
FairOver: STREAM
078070403, Johnson, IA
Built 1973 Load: 33.1 t ADT: 30
LOCAL RD
FairOver: MUD CREEK
100472403, Lyon, IA
Built 1979 Load: 33.1 t ADT: 50
FM
FairOver: BLOOD RUN CREEK
100482204, Lyon, IA
Built 1971 Load: 33.1 t ADT: 350
FM
FairOver: LITTLE OCHEYEDAN RIVER
098400901, Osceola, IA
Built 1977 Load: 33.1 t ADT: 698
FM
FairOver: OCHEYEDON RIVER
099401603, Osceola, IA
Built 1976 Load: 33.1 t ADT: 828
LOCAL
FairOver: WEST BRANCH IOWA RIVER
093241301, Wright, IA
Built 1968 Load: 33.1 t ADT: 51
LOCAL
FairOver: BOONE RIVER
093261602, Wright, IA
Built 1968 Load: 33.1 t ADT: 31
EASTMAN RD
FairOver: TRIB TO MILLER CREEK
87-12-08-01-10, Black Hawk, IA
Built 1983 Load: 33.2 t ADT: 11
Showing 7,201-7,250 of 20,753 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.